Noninvasive interrogation of local flow phenomena in twisted tape swirled flow via positron emission particle tracking ($\mathrm{PEPT}$)

Wiggins, Cody S.; Carasik, Lane B.; Ruggles, Arthur E.

doi:10.1016/j.nucengdes.2021.111601

Title: Noninvasive interrogation of local flow phenomena in twisted tape swirled flow via positron emission particle tracking ($$\mathrm{PEPT}$$)

Journal Article · 15 December 2021 · Nuclear Engineering and Design

DOI: https://doi.org/10.1016/j.nucengdes.2021.111601 · OSTI ID:1977505

Wiggins, Cody S. ^[1]; Carasik, Lane B. ^[2]; Ruggles, Arthur E. ^[3]

Virginia Commonwealth University, Richmond, VA (United States); University of Tennessee, Knoxville, TN (United States); OSTI
Virginia Commonwealth University, Richmond, VA (United States)
University of Tennessee, Knoxville, TN (United States)

Twisted tape inserts are often used to enhance the performance of heat exchangers. Previous simulations suggest the existence of secondary vortices and modified axial velocity profiles in these swirled flows, with only limited experimental evidence for these predictions. Here in this work, positron emission particle tracking (PEPT) is used to interrogate turbulent twisted tape swirl flow in a pipe. PEPT is a noninvasive, radiotracer based flow measurement technique that does not require optical access, making it suitable for measurements in a number of engineering flow systems. The existence of the modified velocity profile and secondary flows is confirmed using PEPT, and flow is seen to still be developing 20 diameters downstream of the twisted channel entrance. Secondary vortices are further confirmed by the presence of increased vorticity in these regions, and turbulent fluctuations are seen to increase in magnitude near these flow structures. These results are in line with predictions and point to possible regions of reduced heat transfer and hot spots in twisted tape based heat exchangers. Suggestions are made for future experiments to investigate heated flows, utilizing the ability of PEPT to image flows in opaque systems for validating simulation of flows in engineering equipment, such as nuclear heat transport equipment.

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Research Organization:: University of Tennessee, Knoxville, TN (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA); USDOE Office of Nuclear Energy (NE), Nuclear Energy University Program (NEUP)

Grant/Contract Number:: NA0001983

OSTI ID:: 1977505

Journal Information:: Nuclear Engineering and Design, Journal Name: Nuclear Engineering and Design Journal Issue: C Vol. 387; ISSN 0029-5493

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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flow measurement
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Title: Noninvasive interrogation of local flow phenomena in twisted tape swirled flow via positron emission particle tracking ($$\mathrm{PEPT}$$)

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